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Título: | Crystal morphology and xrd peculiarities of brazilianite from different localities. |
Autor(es): | Čobić, Andrea Zebec, Vladimir Cipriano, Ricardo Augusto Scholz Bermanec, Vladimir Barreto, Sandra de Brito |
Palavras-chave: | Morfologia - minerais Morphology - minerals Crystal |
Data do documento: | 2011 |
Referência: | ČOBIĆ, A. et al. Crystal morphology and xrd peculiarities of brazilianite from different localities. Natura Croatica, v. 20, p. 1-18, 2011. Disponível em: <http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=104073&lang=en>. Acesso em: 07 out. 2014. |
Resumo: | Forty four brazilianite crystals from several localities in Brazil, Rwanda and Canada were measured on a two-circle goniometer to determine brazilianite morphology. Twenty forms were recorded; six of them have not been recorded before. All faces in the [001] zone are striated along crystallographic axis c. All striated forms in the [001] zone exhibit multiple signals. Two of the signals observed on the form {110} are always very clear. There is an exception on one crystal where just one face, (110), exhibits only one clear signal. Five groups of habits were recorded, two of them new to this mineral species. Eleven samples were examined by X-ray diffraction for calculation of the unit cell parameters yielding a=11.201(1)–11.255(2) Å, b=10.1415(5)–10.155(1) Å, c=7.0885(7)–7.119(2) Å and b=97.431(7)–97.34(1) °. All X-ray diffraction patterns show a peculiarity: some diffraction lines are widened or doubled with the appearance of additional diffraction lines systematically on lower °2Q. These diffraction lines have smaller intensities and cannot be indexed in accordance with brazilianite crystal structure. |
URI: | http://www.repositorio.ufop.br/handle/123456789/4140 |
ISSN: | 1848-7386 |
Licença: | Full-text papers plubished in Natura Croatica can be used for personal or educational purposes only. Authors' and publisher's copyrights must be acknowledged. Fonte: Natura Croatica <http://hrcak.srce.hr/natura-croatica>. Acesso em: 08 out. 2014. |
Aparece nas coleções: | DEGEO - Artigos publicados em periódicos |
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ARTIGO_CrystalMorphologyXRD.pdf Restricted Access | 432,72 kB | Adobe PDF | Visualizar/Abrir |
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